SmogRank / World / Thailand / April 2026

Most polluted cities in Thailand, April 2026

81 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Mae Sai at 112.6 µg/m³, #2 of 2,573 cities in the world. Cleanest: Betong at 14.4. A city needs measurements on 70% of the days to be ranked.

← Mae Sai 112.6
Every city in Thailand ranked for April 2026, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Mae SaiChiang Rai
    112.6
  2. 2NanNan
    99.3
  3. 3PhayaoPhayao
    99.2
  4. 4Chiang RaiChiang Rai
    92.4
  5. 5LamphunLamphun
    82.3
  6. 6LampangLampang
    82.1
  7. 7PhraePhrae
    77.2
  8. 8Chiang MaiChiang Mai
    68.1
  9. 9LoeiLoei
    66.8
  10. 10SukhothaiSukhothai
    66.1
  11. 11Mae SotTak
    61.9
  12. 12UttaraditUttaradit
    59.8
  13. 12PhichitPhichit
    59.8
  14. 14Kamphaeng PhetKamphaeng Phet
    58.0
  15. 15Uthai ThaniUthai Thani
    56.5
  16. 16Ubon RatchathaniUbon Ratchathani
    55.4
  17. 17Nakhon SawanNakhon Sawan
    55.0
  18. 18Chai NatChai Nat
    51.6
  19. 19Suphan BuriSuphan Buri
    49.0
  20. 20Nong Bua LamphuNong Bua Lamphu
    47.9
  21. 21Udon ThaniUdon Thani
    47.6
  22. 22PhetchabunPhetchabun
    46.6
  23. 23Sing BuriSing Buri
    43.5
  24. 24Sakon NakhonSakon Nakhon
    43.0
  25. 25Lop BuriLopburi
    42.6
  26. 25KalasinKalasin
    42.6
  27. 27ChaiyaphumChaiyaphum
    42.2
  28. 28Roi EtRoi Et
    41.5
  29. 29Amnat CharoenAmnat Charoen
    40.7
  30. 30Maha SarakhamMaha Sarakham
    39.3
  31. 31MukdahanMukdahan
    37.8
  32. 32RatchaburiRatchaburi
    35.9
  33. 33Nakhon LuangPhra Nakhon Si Ayutthaya
    35.7
  34. 34YasothonYasothon
    33.5
  35. 35KanchanaburiKanchanaburi
    33.1
  36. 36Si Sa KetSi Sa Ket
    32.5
  37. 37Nakhon RatchasimaNakhon Ratchasima
    32.2
  38. 38Bang Pakonglow-cost sensorsChachoengsao
    31.2
  39. 39PhetchaburiPhetchaburi
    30.7
  40. 40Si Maha PhotPrachin Buri
    30.2
  41. 41Khlong LuangPathum Thani
    29.1
  42. 42SaraburiSaraburi
    28.6
  43. 42Phra Nakhon Si AyutthayaPhra Nakhon Si Ayutthaya
    28.6
  44. 44Bang NaBangkok
    28.4
  45. 45Khlong Sam WaBangkok
    28.0
  46. 46Khan Na YaoBangkok
    27.3
  47. 47Buri RamBuriram
    27.2
  48. 48SurinSurin
    26.9
  49. 49Lat KrabangBangkok
    26.6
  50. 50Phra PradaengSamut Prakan
    26.3
  51. 50Nong ChokBangkok
    26.3
  52. 52Nakhon NayokNakhon Nayok
    26.1
  53. 53Samut SakhonSamut Sakhon
    25.8
  54. 54Sai MaiBangkok
    25.7
  55. 55Saphan SungBangkok
    25.5
  56. 56Nakhon PathomNakhon Pathom
    25.2
  57. 57Bang Bo DistrictSamut Prakan
    25.0
  58. 58Ban Samae DamBangkok
    24.8
  59. 58Bang KapiBangkok
    24.8
  60. 60Mueang NonthaburiNonthaburi
    24.6
  61. 61Nong KhaemBangkok
    24.3
  62. 62Lak SiBangkok
    24.2
  63. 63BangkokBangkok
    24.1
  64. 64AranyaprathetSa Kaeo
    23.8
  65. 65Bueng KumBangkok
    23.1
  66. 66Ban Talat BuengChon Buri
    22.1
  67. 67Ban Khlong PrawetBangkok
    21.9
  68. 68Hua HinPrachuap Khiri Khan
    21.8
  69. 69Samut PrakanSamut Prakan
    21.4
  70. 70SadaoSongkhla
    20.6
  71. 70Ban ChangRayong
    20.6
  72. 72TratTrat
    20.5
  73. 72RayongRayong
    20.5
  74. 74Laem ChabangChon Buri
    19.6
  75. 75RanongRanong province
    18.6
  76. 76ChumphonChumphon
    18.5
  77. 77ChanthaburiChanthaburi
    18.3
  78. 78PhatthalungPhatthalung
    15.9
  79. 78PattaniPattani
    15.9
  80. 80TrangTrang
    15.4
  81. 81BetongYala
    14.4
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, April 2026 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, April 2026, smogrank.com/th/history/2026-04 (accessed 2 Oct 2026).

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